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1 | /* Basic tests for timespec_getres. |
2 | Copyright (C) 2021 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <time.h> | |
20 | #include <support/check.h> | |
21 | ||
22 | static int | |
23 | do_test (void) | |
24 | { | |
25 | { | |
26 | struct timespec ts; | |
27 | TEST_COMPARE (timespec_getres (&ts, 0), 0); | |
28 | TEST_COMPARE (timespec_getres (NULL, 0), 0); | |
29 | } | |
30 | ||
31 | { | |
32 | struct timespec ts; | |
33 | TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC); | |
34 | /* Expect all supported systems to support TIME_UTC with | |
35 | resolution better than one second. */ | |
36 | TEST_VERIFY (ts.tv_sec == 0); | |
37 | TEST_VERIFY (ts.tv_nsec > 0); | |
38 | TEST_VERIFY (ts.tv_nsec < 1000000000); | |
39 | TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC); | |
40 | /* Expect the resolution to be the same as that reported for | |
41 | CLOCK_REALTIME with clock_getres. */ | |
42 | struct timespec cts; | |
43 | TEST_COMPARE (clock_getres (CLOCK_REALTIME, &cts), 0); | |
44 | TEST_COMPARE (ts.tv_sec, cts.tv_sec); | |
45 | TEST_COMPARE (ts.tv_nsec, cts.tv_nsec); | |
46 | } | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
51 | #include <support/test-driver.c> |